<template>
  <div>
     <el-breadcrumb separator-class="el-icon-arrow-right">
      <el-breadcrumb-item :to="{ path: '/home' }">首页</el-breadcrumb-item>
      <el-breadcrumb-item>商品管理</el-breadcrumb-item>
      <el-breadcrumb-item>添加商品</el-breadcrumb-item>
    </el-breadcrumb>

    <!-- 卡片区域 -->
    <el-card>
        <!-- 去  123商品提示区域 -->
        <el-alert title="添加商品信息" type="info" center show-icon :closable="false"> </el-alert>
        <!-- 步骤条 -->
        <el-steps :space="200" :active="activeIndex - 0" finish-status="success" align-center>
         <el-step title="基本信息"></el-step>
         <el-step title="商品参数"></el-step>
         <el-step title="商品属性"></el-step>
         <el-step title="商品图片"></el-step>
         <el-step title="商品内容"></el-step>
         <el-step title="完成"></el-step>
        </el-steps>

      <el-form :model="addForm" :rules="addFormRules" ref="addFormRef" label-width="100px" label-position="top">
        <!-- tab栏区域 -->
        <el-tabs v-model="activeIndex" :tab-position="'left'" :before-leave="beforeTabLeave" @tab-click="tabClicked">
            <el-tab-pane label="基本信息" name='0'>
                <el-form-item label="商品名称" prop="goods_name">
                    <el-input v-model="addForm.goods_name"></el-input>
                </el-form-item>
                <el-form-item label="商品价格" prop="goods_price">
                    <el-input v-model="addForm.goods_price" type="number"></el-input>
                </el-form-item>
                <el-form-item label="商品重量" prop="goods_weight">
                    <el-input v-model="addForm.goods_weight" type="number"></el-input>
                </el-form-item>
                <el-form-item label="商品数量" prop="goods_number">
                    <el-input v-model="addForm.goods_number" type="number"></el-input>
                </el-form-item>
                <el-form-item label="商品分类" prop="">
                     <el-cascader
                        expand-trigger="hover"
                        :options="cateList"
                        :props="cateProps"
                        v-model="addForm.goods_cat"
                        @change="handleChange">
                    </el-cascader>
                </el-form-item>
            </el-tab-pane>
            <el-tab-pane label="商品参数" name='1'>
                <!-- 渲染表单的item项 -->
                <el-form-item :label="item.attr_name" :key="item.attr_id" v-for="item in manyTableData">
                    <el-checkbox-group v-model="item.attr_vals">
                        <el-checkbox border :label="val" v-for="(val,i) in item.attr_vals" :key="i"></el-checkbox>
                    </el-checkbox-group>
                </el-form-item>
            </el-tab-pane>
            <el-tab-pane label="商品属性" name='2'>
                <!-- 循环生成静态属性 -->
                <el-form-item :label="item.attr_name" v-for="item in onlyTableData" :key="item.attr_id">
                    <el-input v-model="item.attr_vals"></el-input>
                </el-form-item>
            </el-tab-pane>
            <el-tab-pane label="商品图片" name='3'>
                <!-- action图片上传到后台的api地址 -->
                <el-upload
                :headers="headerObj"
                :action="uploadURL"
                :on-preview="handlePreview"
                :on-remove="handleRemove"
                list-type="picture"
                :on-success="handleSuccess">
                <el-button size="small" type="primary">点击上传</el-button>
                <div slot="tip" class="el-upload__tip">只能上传jpg/png文件，且不超过500kb</div>
                </el-upload>
            </el-tab-pane>
            <el-tab-pane label="商品内容" name='4'>
                <!-- 富文本编辑器 -->
                <quill-editor v-model="addForm.goods_introduce"></quill-editor>
                <!-- 添加商品的按钮 -->
                <el-button type="primary" class="btnAdd" @click="add">添加商品</el-button>
            </el-tab-pane>
        </el-tabs>
      </el-form>
    </el-card>


    <!-- 图片预览 -->
    <el-dialog title="图片预览" :visible.sync="previewVisible" width="50%">
        <img :src="previewPath" alt="" class="previewImg">
    </el-dialog>
  </div>
</template>

<script>
import _ from 'lodash'

export default {
  data(){
      return{
          activeIndex: '0',
          addForm:{
            goods_name: '',
            goods_price: 0,
            goods_weight: 0,
            goods_number: 0,
            goods_cat: [],
            attrs:[],
            //上传图片数组
            pics: [],
            goods_introduce:'',
          },
          addFormRules:{
              goods_name: [
                { required: true, message: '请输入商品名称', trigger: 'blur' }
                ],
                goods_price: [
                { required: true, message: '请输入商品价格', trigger: 'blur' }
                ],
                goods_weight: [
                { required: true, message: '请输入商品重量', trigger: 'blur' }
                ],
                goods_number: [
                { required: true, message: '请输入商品数量', trigger: 'blur' }
                ],
                goods_cat: [
                { required: true, message: '请选择商品分类', trigger: 'blur' }
                ]
          },
          cateList:[],
          cateProps:{
              label:'cat_name',
              value:'cat_id',
              children:'children'
          },
          goods_cat:[],
          manyTableData: [],
          onlyTableData:[],
          uploadURL:'http://127.0.0.1:8888/api/private/v1/upload',
          headerObj:{
            Authorization: window.sessionStorage.getItem('token')
          },
          previewPath:"",
          previewVisible:false,
          goods_introduce:false,
         
      }
  },
  created(){
      this.getCateList()
  },
  methods:{
      async getCateList(){
          const {data:res} = await this.$http.get('categories')
          if(res.meta.status !== 200){
              return this.$message.error('获取商品分类数据失败')
          }
          this.cateList = res.data

      },
      handleChange(){
          console.log(this.addForm.goods_cat)
          if(this.addForm.goods_cat.length !== 3) {
              this.addForm.goods_cat = []
              return
          }
      },
      beforeTabLeave(activeName,oldActiveName) {
        //   console.log('即将离开的标签页的名字是' + oldActiveName)
        //   console.log('即将进入的标签页的名字是' + activeName)
        if(this.addForm.goods_cat.length !== 3 && oldActiveName === '0') {
            this.$message.error('请选择商品分类')
            return false
        }
      },
      async tabClicked() {
       //当用户点击切换tab栏时触发
       if (this.activeIndex === '1') {
        //发送请求获取动态参数
        const { data: res } = await this.$http.get(
          `categories/${this.cateId}/attributes`,
          { params: { sel: 'many' } }
        )

        if (res.meta.status !== 200) {
          return this.$message.error('获取动态参数列表失败')
        }
        //将attr_vals字符串转换为数组
        res.data.forEach(item => {
          item.attr_vals =
            item.attr_vals.length === 0 ? [] : item.attr_vals.split(' ')
        })
        this.manyTableData = res.data
        } else if (this.activeIndex === '2') {
        //发送请求获取静态属性
        const { data: res } = await this.$http.get(
          `categories/${this.cateId}/attributes`,
          { params: { sel: 'only' } }
        )

        if (res.meta.status !== 200) {
          return this.$message.error('获取静态属性列表失败')
        }

        this.onlyTableData = res.data
      }
    },
    handleRemove(file){
        console.log(file)
        //当用户点击X号删除时执行
       //形参file就是用户点击删除的文件
       //获取用户点击删除的那个图片的临时路径
       const filePath = file.response.data.tmp_path
       //使用findIndex来查找符合条件的索引
       const index = this.addForm.pics.findIndex(item => item.pic === filePath)
       //移除索引对应的图片
       this.addForm.pics.splice(index, 1)
    },
    handlePreview(file){
        console.log(file)
        this.previewPath = file.response.data.url;
        this.previewVisible = true
    },
    handleSuccess(response){
        console.log(response)
         //当上传成功时触发执行
     //形参response就是上传成功之后服务器返回的结果
     //将服务器返回的临时路径保存到addForm表单的pics数组中
      this.addForm.pics.push({ pic: response.data.tmp_path })
    },
    add(){
        this.$refs.addFormRef.validate(async valid=>{
            if(!valid) {
                return this.$message.error('请填写必要的表单项')
            }
            // lodash cloneDeep深拷贝
            const form = _.cloneDeep(this.addForm)
            form.goods_cat =form.goods_cat.join(',')
            
            //处理attrs数组，数组中需要包含商品的动态参数和静态属性
            //将manyTableData（动态参数）处理添加到attrs
            this.manyTableData.forEach(item=>{
                const newInfo = {
                    attr_id:item.attr_id, attr_value:item.attr_vals.join(' ') 
                }
                this.addForm.attrs.push(newInfo)
            })
            
            //将onlyTableData（静态属性）处理添加到attrs
            this.onlyTableData.forEach(item=>{
            const newInfo = {
                    attr_id:item.attr_id, attr_value:item.attr_vals 
                }
                this.addForm.attrs.push(newInfo)
            })
            form.attrs = this.addForm.attrs
             console.log(form)
            //发送请求完成商品的添加,商品名称必须是唯一的
            const {data:res} = await this.$http.post('goods',form)
            if(res.meta.status !== 201){
            return this.$message.error('添加商品失败')
            }
            this.$message.success('添加商品成功')
            //编程式导航跳转到商品列表
            this.$router.push('/goods')
           
        })
    },
  },
   computed: {
    cateId() {
      if (this.addForm.goods_cat.length === 3) {
        return this.addForm.goods_cat[2]
      }
      return null
    }
  }
  
}
</script>

<style lang="less" scoped>
   .previewImg{
       width:100%;
   }
   .btnAdd{
       margin-top: 15px;
   }
</style>
